Remove duplicate claims

fever.py

@@ -134,6 +134,11 @@ class Fever(datasets.GeneratorBasedBuilder):
         ),
     ]
 
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.seen_claims= set()
+
+
     def _info(self):
         if self.config.name == "wiki_pages":
             features = {
@@ -187,6 +192,10 @@ class Fever(datasets.GeneratorBasedBuilder):
                         continue
 
                     claim = data["claim"]
+                    if claim in self.seen_claims:
+                        continue
+                    else:
+                        self.seen_claims.add(claim)
                     evidences = data.get("evidence", [])
                     if len(evidences) > 0:
                         for i in range(len(evidences)):